y.tab.c,v

TCP-IP红宝书源代码

int	len;
{
	int	base, rv;

	if (*p == '0') {
		++p; --len;
		if (*p == 'x' || *p == 'X') {
			++p; --len;		/* skip 'x' */
			base = 16;
		} else
			base = 8;
	} else
		base = 10;
	rv = 0;
	for (; len > 0; ++p, --len) {
		rv *= base;
		if (isdigit(*p))
			rv += *p - '0';
		else if (isupper(*p))
			rv += *p - 'A' + 10;
		else
			rv += *p - 'a' + 10;
	}
	return rv;
}

/* newattr -- add a new attribute spec to current type/device description	*/

newattr(tok,val)
	int	tok;			/* token type (attribute type)	*/
	int	val;			/* symbol number of value	*/
{
	char	*c;
	dvptr	s;

	if (devs == NIL)		/* doing types			*/
		s = currtype;
	else
		s = lastdv;
	if (val>=0 && val<nsym) {
		c = symtab[val].symname;
		if (strlen(c) > 20 ) {
			fprintf(stderr,"Internal overflow\n");
			exit(1);
		}
	} else
		c = NULL;

	switch (tok) {

	case CSR:	s->dvcsr = val;
			break;
	case IVEC:	s->dvivec = val;
			break;
	case OVEC:	s->dvovec = val;
			break;
	case IRQ:	s->dvovec = s->dvivec = val;
			break;
	case IINT:	strcpy(s->dviint,c);
			break;
	case OINT:	strcpy(s->dvoint,c);
			break;
	case READ:	strcpy(s->dvread,c);
			break;
	case WRITE:	strcpy(s->dvwrite,c);
			break;
	case GETC:	strcpy(s->dvgetc,c);
			break;
	case PUTC:	strcpy(s->dvputc,c);
			break;
	case OPEN:	strcpy(s->dvopen,c);
			break;
	case CLOSE:	strcpy(s->dvclose,c);
			break;
	case INIT:	strcpy(s->dvinit,c);
			break;
	case SEEK:	strcpy(s->dvseek,c);
			break;
	case CNTL:	strcpy(s->dvcntl,c);
			break;
	default:	fprintf(stderr, "Internal error 1\n");
	}
}

/* cktname  --  check type name for duplicates */

cktname(symid)
	int symid;
{
	dvptr	s;
extern	dvptr	ftypes;
	char	*name;

	name = symtab[symid].symname;
	for (s=ftypes; s!=NIL ; s=s->dvnext) {
		if (s->dvtname == name) {
			fprintf(stderr,"Duplicate type name %s on line %d\n",
				name,linectr);
			exit(1);
			}
		}
	return(symid);
}

/* mktype  --  make a node in the type list and initialize to defaults	*/

mktype(deviceid)
	int deviceid;
{
	dvptr	s,p;
	char	*tn,*dn;

	p = NIL;
	tn = symtab[currtname].symname;
	dn = symtab[deviceid].symname;
	for (s = ftypes; s!=NIL ; s=s->dvnext) {
		if (s->dvtname == tn && s->dvdevice==dn) {
		   fprintf(stderr,
		     "Duplicate device %s for type %s on line %d\n",
		     dn, tn, linectr);
		   exit(1);
		}
		p = s;
	}
	currtype = s = (dvptr) malloc( sizeof(struct dvtype));
	if (ftypes != NIL) {
		p->dvnext = s;
	}
	else {
		ftypes = s;
	}
	initattr(s, currtname, deviceid);
}

/* initialize attributes in a type declaration node to typename...	*/

initattr(fstr, tnum, deviceid)
	dvptr	fstr;
	int	tnum;
	int	deviceid;
{
	char	*typnam;

	typnam = symtab[tnum].symname;
	fstr->dvname = NULL;
	fstr->dvtname = typnam;
	fstr->dvtnum = tnum;
	fstr->dvdevice = symtab[deviceid].symname;
	fstr->dvcsr = 0;
	fstr->dvivec = 0;
	fstr->dvovec = 0;
	strcpy(fstr->dviint,typnam);
	strcat(fstr->dviint,"iin");
	strcpy(fstr->dvoint,typnam);
	strcat(fstr->dvoint,"oin");
	strcpy(fstr->dvinit,typnam);
	strcat(fstr->dvinit,"init");
	strcpy(fstr->dvopen,typnam);
	strcat(fstr->dvopen,"open");
	strcpy(fstr->dvclose,typnam);
	strcat(fstr->dvclose,"close");
	strcpy(fstr->dvread,typnam);
	strcat(fstr->dvread,"read");
	strcpy(fstr->dvwrite,typnam);
	strcat(fstr->dvwrite,"write");
	strcpy(fstr->dvcntl,typnam);
	strcat(fstr->dvcntl,"control");
	strcpy(fstr->dvseek,typnam);
	strcat(fstr->dvseek,"seek");
	strcpy(fstr->dvgetc,typnam);
	strcat(fstr->dvgetc,"getc");
	strcpy(fstr->dvputc,typnam);
	strcat(fstr->dvputc,"putc");
	fstr->dvminor = 0;
}

/* mkdev  --  make a node on the device list */

mkdev(nameid, typid, deviceid)
	int	nameid, typid, deviceid;
{
	dvptr	s;
	char	*devn,*tn,*dn;
	int	found;

	s = (dvptr) malloc(sizeof(struct dvtype));
	s->dvnext = NIL;
	if (devs == NIL) {
		devs = s;
		lastdv = s;
	} else {
		lastdv->dvnext = s;
		lastdv = s;
	}
	ndevs++;
	tn = symtab[typid].symname;
	devn = symtab[nameid].symname;
	if (deviceid >= 0)
		dn = symtab[deviceid].symname;
	else
		dn = NULL;
	found = 0;
	for (s=ftypes ; s != NULL ; s=s->dvnext)
		if (s->dvtname == tn && (dn==NULL || s->dvdevice==dn)) {
			strdup(lastdv,s,sizeof(struct dvtype));
			found=1;
			break;
		}
	if (found==0) {
		fprintf(stderr,
		  "Bad type or device name in declaration of %s on line %d\n",
		  devn, linectr);
		exit(1);
	}
	lastdv->dvnext = NIL;
	lastdv->dvname = devn;
}


/* chdname  -- check for duplicate device name */

ckdname(devid)
	int devid;
{
	dvptr	s;
extern	dvptr	devs;
	char	*name;

	name = symtab[devid].symname;
	for (s=devs; s!=NIL ; s=s->dvnext) {
		if (s->dvname == name) {
			fprintf(stderr,"Duplicate device name %s on line %d\n",
				name,linectr);
			exit(1);
			}
		}
	return(devid);
}

strdup(tostr,fromstr,len)
	char	*tostr, *fromstr;
	int	len;
{
	for( ; len > 0 ; len--)
		*tostr++ = *fromstr++;
}
#line 768 "y.tab.c"
#define YYABORT goto yyabort
#define YYREJECT goto yyabort
#define YYACCEPT goto yyaccept
#define YYERROR goto yyerrlab
int
yyparse()
{
    register int yym, yyn, yystate;
#if YYDEBUG
    register char *yys;
    extern char *getenv();

    if (yys = getenv("YYDEBUG"))
    {
        yyn = *yys;
        if (yyn >= '0' && yyn <= '9')
            yydebug = yyn - '0';
    }
#endif

    yynerrs = 0;
    yyerrflag = 0;
    yychar = YYEMPTY;

    yyssp = yyss;
    yyvsp = yyvs;
    *yyssp = yystate = 0;

yyloop:
    if (yyn = yydefred[yystate]) goto yyreduce;
    if (yychar < 0)
    {
        if ((yychar = YYLEX) < 0) yychar = 0;
#if YYDEBUG
        if (yydebug)
        {
            yys = 0;
            if (yychar <= YYMAXTOKEN) yys = yyname[yychar];
            if (!yys) yys = "illegal-symbol";
            printf("%sdebug: state %d, reading %d (%s)\n",
                    YYPREFIX, yystate, yychar, yys);
        }
#endif
    }
    if ((yyn = yysindex[yystate]) && (yyn += yychar) >= 0 &&
            yyn <= YYTABLESIZE && yycheck[yyn] == yychar)
    {
#if YYDEBUG
        if (yydebug)
            printf("%sdebug: state %d, shifting to state %d\n",
                    YYPREFIX, yystate, yytable[yyn]);
#endif
        if (yyssp >= yyss + yystacksize - 1)
        {
            goto yyoverflow;
        }
        *++yyssp = yystate = yytable[yyn];
        *++yyvsp = yylval;
        yychar = YYEMPTY;
        if (yyerrflag > 0)  --yyerrflag;
        goto yyloop;
    }
    if ((yyn = yyrindex[yystate]) && (yyn += yychar) >= 0 &&
            yyn <= YYTABLESIZE && yycheck[yyn] == yychar)
    {
        yyn = yytable[yyn];
        goto yyreduce;
    }
    if (yyerrflag) goto yyinrecovery;
#ifdef lint
    goto yynewerror;
#endif
yynewerror:
    yyerror("syntax error");
#ifdef lint
    goto yyerrlab;
#endif
yyerrlab:
    ++yynerrs;
yyinrecovery:
    if (yyerrflag < 3)
    {
        yyerrflag = 3;
        for (;;)
        {
            if ((yyn = yysindex[*yyssp]) && (yyn += YYERRCODE) >= 0 &&
                    yyn <= YYTABLESIZE && yycheck[yyn] == YYERRCODE)
            {
#if YYDEBUG
                if (yydebug)
                    printf("%sdebug: state %d, error recovery shifting\
 to state %d\n", YYPREFIX, *yyssp, yytable[yyn]);
#endif
                if (yyssp >= yyss + yystacksize - 1)
                {
                    goto yyoverflow;
                }
                *++yyssp = yystate = yytable[yyn];
                *++yyvsp = yylval;
                goto yyloop;
            }
            else
            {
#if YYDEBUG
                if (yydebug)
                    printf("%sdebug: error recovery discarding state %d\n",
                            YYPREFIX, *yyssp);
#endif
                if (yyssp <= yyss) goto yyabort;
                --yyssp;
                --yyvsp;
            }
        }
    }
    else
    {
        if (yychar == 0) goto yyabort;
#if YYDEBUG
        if (yydebug)
        {
            yys = 0;
            if (yychar <= YYMAXTOKEN) yys = yyname[yychar];
            if (!yys) yys = "illegal-symbol";
            printf("%sdebug: state %d, error recovery discards token %d (%s)\n",
                    YYPREFIX, yystate, yychar, yys);
        }
#endif
        yychar = YYEMPTY;
        goto yyloop;
    }
yyreduce:
#if YYDEBUG
    if (yydebug)
        printf("%sdebug: state %d, reducing by rule %d (%s)\n",
                YYPREFIX, yystate, yyn, yyrule[yyn]);
#endif
    yym = yylen[yyn];
    yyval = yyvsp[1-yym];
    switch (yyn)
    {
case 2:
#line 95 "config.y"
{doing = "device definitions";}
break;
case 8:
#line 106 "config.y"
{mktype(yyvsp[0]);}
break;
case 9:
#line 109 "config.y"
{yyval = currtname = cktname(yyvsp[-1]);}
break;
case 10:
#line 112 "config.y"
{yyval = currname =
					 lookup(yytext,yyleng);
					}
break;
case 13:
#line 120 "config.y"
{newattr(CSR,yyvsp[0]);}
break;
case 14:
#line 122 "config.y"
{newattr(IVEC,yyvsp[0]);}
break;
case 15:
#line 124 "config.y"
{newattr(OVEC,yyvsp[0]);}
break;
case 16:
#line 126 "config.y"
{newattr(IRQ,yyvsp[0] +IRQBASE);}
break;
case 17:
#line 128 "config.y"
{newattr(IINT,yyvsp[0]);}
break;
case 18:
#line 130 "config.y"
{newattr(OINT,yyvsp[0]);}
break;
case 19:
#line 132 "config.y"
{newattr(OPEN,yyvsp[0]);}
break;
case 20:
#line 134 "config.y"
{newattr(CLOSE,yyvsp[0]);}
break;
case 21:
#line 136 "config.y"
{newattr(INIT,yyvsp[0]);}
break;
case 22:
#line 138 "config.y"
{newattr(GETC,yyvsp[0]);}
break;
case 23:
#line 140 "config.y"
{newattr(PUTC,yyvsp[0]);}
break;
case 24:
#line 142 "config.y"
{newattr(READ,yyvsp[0]);}
break;
case 25:
#line 144 "config.y"
{newattr(WRITE,yyvsp[0]);}
break;
case 26:
#line 146 "config.y"
{newattr(SEEK,yyvsp[0]);}
break;
case 27:
#line 148 "config.y"
{newattr(CNTL,yyvsp[0]);}
break;
case 28:
#line 151 "config.y"
{yyval = atoi(yytext,yyleng);}
break;
case 32:
#line 159 "config.y"
{mkdev(yyvsp[-3],yyvsp[-1],yyvsp[0]);}
break;
case 33:
#line 162 "config.y"
{yyval = currdname = ckdname(yyvsp[0]);}
break;
case 34:
#line 165 "config.y"
{yyval = 0;}
break;
case 35:
#line 167 "config.y"
{yyval = yyvsp[0];}
break;
#line 1007 "y.tab.c"
    }
    yyssp -= yym;
    yystate = *yyssp;
    yyvsp -= yym;
    yym = yylhs[yyn];
    if (yystate == 0 && yym == 0)
    {
#if YYDEBUG
        if (yydebug)
            printf("%sdebug: after reduction, shifting from state 0 to\
 state %d\n", YYPREFIX, YYFINAL);
#endif
        yystate = YYFINAL;
        *++yyssp = YYFINAL;
        *++yyvsp = yyval;
        if (yychar < 0)
        {
            if ((yychar = YYLEX) < 0) yychar = 0;
#if YYDEBUG
            if (yydebug)
            {
                yys = 0;
                if (yychar <= YYMAXTOKEN) yys = yyname[yychar];
                if (!yys) yys = "illegal-symbol";
                printf("%sdebug: state %d, reading %d (%s)\n",
                        YYPREFIX, YYFINAL, yychar, yys);
            }
#endif
        }
        if (yychar == 0) goto yyaccept;
        goto yyloop;
    }
    if ((yyn = yygindex[yym]) && (yyn += yystate) >= 0 &&
            yyn <= YYTABLESIZE && yycheck[yyn] == yystate)
        yystate = yytable[yyn];
    else
        yystate = yydgoto[yym];
#if YYDEBUG
    if (yydebug)
        printf("%sdebug: after reduction, shifting from state %d \
to state %d\n", YYPREFIX, *yyssp, yystate);
#endif
    if (yyssp >= yyss + yystacksize - 1)
    {
        goto yyoverflow;
    }
    *++yyssp = yystate;
    *++yyvsp = yyval;
    goto yyloop;
yyoverflow:
    yyerror("yacc stack overflow");
yyabort:
    return (1);
yyaccept:
    return (0);
}
@